That's strange, the first trailer very much made him out to be a DS2 giant, I feel like it was a change during development.
How did it "make him out" to be anything other than a big dude? Just because you couldn't see his face in the cinematic?
Giants were a pretty big theme in Dark 2, and Yhorm's backstory certainly hints at some mistrust towards giants (as a universal race), so maybe you could say Yhorm represents them (being pretty much the only "giant" in the game).
But come now, why would there be a change during development? I resent the idea that every time someone makes an assumption, there has to be a crazy web of conspiracy hidden beneath that proves they were right to begin with.